Explanation:
Water is used in many tests as solvent for dissolving solutes.
No ions, compounds or salts are present in distilled water. Therefore, test result will not be affected by distilled water.
If plain water is used instead of distilled water, the ions or other salts present in plain water, may undergo chemical reaction with the reagent and may affect the test result.
Consider an example,
Concentration of 
is determined by potassium permanganate using titration method
solution of both and potassium permanganate are made in water.
Potassium permanganate is titrant and is used as titrand.
Concentration of is determined by end point. if the water used for making solution is not distilled, it may affect end point, which results in incorrect determination of concentration of .
Therefore, distilled should be used for chemical tests.
You could Build a <span>Gumdrop Geodesic Dome !
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Geodesic domes are approximately sphere-like structures made up of interconnected triangles. A famous geodesic dome is Spaceship Earth at EPCOT in Walt Disney World, Florida, but geodesic domes are also commonly found as climbing domes at playgrounds. In this science activity, you will get to build a simple geodesic dome using gumdrops and toothpicks. Once it is built, you may be surprised by how strong it is! Get ready to do some tasty engineering!
Materials:
<span> Gumdrops (11). Alternatively, jelly beans or other semi-firm, chewy candies may be used. <span> Toothpicks (25)
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Instructions:
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1.Attach five toothpicks together using the gumdrops to form a flat pentagon (five-pointed) shape. You should have a gumdrop at each point and a toothpick along each edge.
2.Poke two more toothpicks into each gumdrop, arranging the new toothpicks so that they are pointing up.
3.Take five new gumdrops and attach them to the top of the new toothpicks, putting two toothpicks into each gumdrop, to form triangles. (The pentagon should form the base of the triangle, and the new gumdrops should form the top point.) You should end up with five triangles this way.
4.Attach a toothpick between the top points of the triangles you just made, connecting the triangles together. This uses five toothpicks, and will create another pentagon shape, this time at the top of the dome.
5.Take five more toothpicks and poke one into each of the five gumdrops that make up the top pentagon. Arrange the new toothpicks so that they are pointing up. Then poke all five toothpicks into a gumdrop in the middle, and at the top, of the dome. Your geodesic dome is complete!
6.Gently press down on the top of your geodesic dome. If it does not break, try carefully pressing down on it a little more.
Prior to this people believed that the earth was the center of the universe, with this revolution the belief was the earth revolved around the sun and was not the center of the universe<span>
Hope this helps</span>
Answer:
Kinetic and potential energies are found in all objects. If an object is moving, it is said to have kinetic energy (KE). Potential energy (PE) is energy that is "stored" because of the position and/or arrangement of the object. The classic example of potential energy is to pick up a brick.
Explanation:
Kinetic energy is the energy of mass (an object) in motion (moving). The faster an object is moving, the more kinetic energy it has. Any object that is moving has kinetic energy – the moving object has energy because of its motion.
